LOL.. Not even going to ask about the sugar Mario.

A quick google of "R56 pistons failure" will get you a treasure trove of pistons failures on stock boost with anywhere from 30 to 60k miles. But lots more on upped boost. If you plan on upgrading the internals to handle high boost, plan on spending about $4000. Maybe a little less depending on what you have done at the same time. CP pistons run about $650, Mahle about $750, Pauter rods run about $950 and Carrillo about $1500. Add in new timing chain, Mahle trimetal bearings, ARP stud kits, gaskets, misc hardware, machining, labor and there you are. He'll most of us have spent a lot more than that on the other mods on our cars. So not a bad investment for the peace of mind.

You can also do some searching and buy a builder motor from a wrecked Cooper. Then take your time building it exactly the way you want.

If however you decide to run the risk and lose a piston be ready to kiss your wallet goodbye. Damn... I hate it when when I have to be a voice or reason. Think I'll go see what I can find on-line for tuning with nitrous.

 

GP has the exact same N18B16C engine as all N18 JCW's. We have dyno'd both JCW and GP's with exact same supporting mods and Manic Maps and achieved identical power levels.

 

To me they seem very close, but they do list the GP2 with higher CR than the JCW

 

I have the GP2 brochure and it says "10.5:1/91-98 RON" just like my N14 and N18 MCS. It's only got 3hp more than a JCW 208hp, GP2 211hp.

 

True, but the JCW brochure shows the CR at 10.0 or 10.1.
I bought my GP2 because of the uniqueness and all the details, not for the HP. Of course after adding some key products, my GP2 is pretty quick

 

So from an armature and or layman's point of view what are we talking about when referencing lower or higher compression ratios???

 

Hey Rox, yes CR = Compression Ratio. Back in the day, cars that were boosted always had low compression, but now a days with greatly improved Tecnology and Di = Direct Injection, cars are able to have higher CR and be boosted. This helps with efficiency, MPG's, lag and emissions.
High CR and lots of boost, reminds me of that saying. How do you get 10lbs of **** into a 5lb bag.

 

I feel the story may be different for the MCS vs the JCW & GP. If the factory felt comfortable to run manifold pressure temporarily up to 22 psi in the latter cars all while keeping a/f ratios relatively high (for emissions) then the motors probably have a buffer for tuners to be more aggressive. I figure the factory plays it conservative so they are not buying owners new motors while under warranty. With lower coolant temps, meth to cool IAT and richer A/F ratios to stave off detonation, motors have a much better chance to survive. It would be nice to know exactly what mods the factory used in these motors. It would be nice if these engines employed proper knock sensors, then the timing could really be aggressive and our motors protected.

 

I think the weakest link is the pistons especially the ring landings, I wish Mini had used forged pistons with more material under the ring landings.

 

Just wanted to share, Map C is outstanding. So much power! So far so good with my 315cc Nozzle. Both Timing and Temps are steady with todays pulls.

Here is a Log sample:


This pull was done in the same location as my previous Log, temp was 79deg w/72% Humidity. gained an extra 18hp according to Dash Command, LOL.

I need to get on a track

 

Are you monitoring AFR? I was wondering if Manic was suggesting 500cc/m flow rate because they leaned out fueling in anticipation of the meth.

 

I've been seeing steady 11.5 for my AFRs. It seems to jump straight to that number when I'm at WOT. I cant for the life of me get the scan XL to show my AFRs.

 

Good I was just wondering about that.

What PID are you using? I've never had a problem. I use calc.afr_actual

 

When I select that one it says none. Is it because I have the unlicensed version?

 

Not sure. But try the lambda PIDs, see if they work.

 

So that actually worked, but still confused. Scan XL says 1, at full boost. and on my phone the DC shows it bouncing between 1.0 and 0.8

How do you translate

Edit: I was able to translate on DC, the line was teetering around 0.85Lamda, which translated to 11.1:1 which is the richest I've seen it. It was varying between 11.1-11.4.

Are these AFRs good, or a little too rich?

 

IMO a lambda .78 - .80 would be nice and safe at WOT. Which corresponds to 11.4 - 11.8 "displayed" AFR. The multiplication factor is 14.6 for gasoline. Since you're spraying a lot of meth then look at lambda since it is independent on fuel type.

 

cerenkov , Hit it right on the head with fuel type. Methanol stoichiometric is 5.0:1 - 6.0:1
So with as much meth that is being sprayed it would require a lot of math to figure out exactly what the ideal reading would be for mixed if converting to AFR. Lambda reading would be better gauge as it is unconverted. As for the Manic tunes they have not been leaned out for meth for the cars we mapped. Manic tunes are built to order so yours might be different. We load Meth/Race gas file as Map C so the power is all in the timing and there is no leaning out. The car doesn't know if we are running meth or 100 octane just that it can add all the timing programmed in without triggering the knock sensor.

 

Thanks Fella's,

Did some more logging yesterday and saw averages of:

• LAMBDA .76-.8
• timing climbs as high as 15deg steadily
• IAT avg. 10deg below ambient
• Boost peaking as high as 21.5 in Map C, but usually holds to redline at about 18-19psi.

Im no Tuner but besides being a little rich on the top end, I believe the DME is liking this tune and is pushing efficiently.

Hope to get some feed back and tips of what else I should be looking for. I don't believe that a larger Nozzle is needed, seeing how rich I'm running at the top end.

Overall all Maps add power. A is well rounded. B is nicer at top end and C just rips once at WOT. Biggest issue I am having is traction.

 

I am sure Nick recommended 500cc for a reason. I would stick to what he recommended since he created the maps. Would hate for something to happen due to lack of Meth.

Traction is the biggest issue we have with the GP2's. Still running Map B on the tracks until we install limited slips since the "ELSD" is just apply brakes all the time.

 

You make a good point. I know a few on here who were hesitant to push that much Meth. I will pick up that 500cc nozzle and then do some back to back logging. That should set me right...

Thanks.

 

Can you log short term and long term fuel trims. I wouldn't imagine that there are issues just curious if the trims max out at 500cc.

 

I'll tried that when I get the nozzle. I tried looking at what my trims were on previous logs. I know it works live, but for some reason I can't do a play back. I'll figure it out though.

 

I spoke with Jeff from Howerton and he said 500cc is not crazy. I thought it was before I started running it. I was very hesitant at first.

 

Have you been running it?
If so, what are your numbers looking like?
Do you feel any added power?